Final answer:
Elena's house is reflected across the x-axis; thus, if Jo's house is at (x, y), Elena's house is at (x, -y), maintaining the x-coordinate but inverting the y-coordinate's sign.
Step-by-step explanation:
To answer the question about the coordinates of Elena's house being a reflection of Jo's house across the x-axis, we would need to know the original coordinates of Jo's house. If for example, Jo's house is at coordinates (x, y), then Elena's house, being a reflection across the x-axis, would be at coordinates (x, -y). This means that the x-coordinate remains the same but the y-coordinate is the negative of Jo's y-coordinate.
Elena's house is a reflection of Jo's house across the x-axis. When a point is reflected across the x-axis, the y-coordinate changes sign. So, if Jo's house has coordinates (x, y), then Elena's house will have coordinates (x, -y).
For example, if Jo's house is located at (3, 5), then Elena's house will be located at (3, -5).
In general, when you reflect a point across the x-axis, you change the sign of the y-coordinate while keeping the x-coordinate unchanged. It's important to remember that the x-axis acts like a mirror lying horizontally.